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Old 07-15-2011, 09:50 AM   #1
Scooby Newbie
Member#: 252286
Join Date: Jul 2010
Default AP datalogs and CEL?

So I'm new to this whole AP thing and don't really know how to read the datalogs yet, wondering if some of the more knowledgeable people on here might be able to help me out a bit.

For starters, I have an '04 STi with 3" Greddy catback, APS 65mm intake, and AP. I installed the intake and AP a couple weeks ago and reflashed with 91 octane stg 2 map. Within 5-10 mins, I got a CEL and the cruise light started flashing, cruising at hwy speed in 6th gear. Checked it and it came back P0171- Bank 1 lean. I reset the ecu and the CEL never came back that trip so I logged a couple pulls, datalog 1 and 2.

A few days later when I had the car out again, the same thing happened. CEL came on, just driving around town, P0171 again. I decided to reflash with stg 1 and see if that got rid of the CEL. After resetting/reflashing the ECU, no CEL returned, so I logged a couple pulls in 4th. (datalog 3 and 4)

I thought maybe stg1 got rid of the CEL but it came back on last night, about 5-10 mins after start-up, at in-town speed and low rpm. I'm assuming from a little bit of research that its the intake causing my CEL, but I'm wondering if anybody can check my logs to make sure its not something else.
I know in stg2, my boost levels are low, that I might have to use HWG, but I first need to install a 3" dp before going stg2.

Also, datalog 5 is my attempt at capturing a stutter I'm experiencing between 2500-3000 rpms, in any gear. I've done a little looking on here and it seems like the stutter is pretty common, and that its very difficult to pinpoint why, but thought maybe I could capture it in the datalog.

Ahhh it seems I can't find an accessible file host here at work, so I'll have to post datalogs when I get home tonight.
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Old 07-15-2011, 10:18 AM   #2
Cobb Tuning
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX

Hi there. Sorry for the trouble you've been experiencing.

Our OTS maps are not compatible with any intake other than what is specified by the map. For the 04 STi, this is only the stock intake and Cobb SF intake.

Using another intake will cause a whole host of potential issues such as incorrect fueling and timing. This has the potential to cause engine damage. In your situation, I would recommend that you put the stock intake back on immediately.

That said, it is possible to tune for an aftermarket intake. You could take your car to one of our ProTUNERs and have a custom tune done via the AccessPORT. Or, if you feel like tackling it yourself, you can request a free copy of our AccessTUNER Race software (you will additionally need a wideband o2 sensor). Otherwise, you will need to put the stock intake back on or get a Cobb SF intake.

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Old 07-15-2011, 12:58 PM   #3
Scooby Newbie
Member#: 265204
Join Date: Nov 2010
Chapter/Region: MAIC
Location: Fairfax, VA
2009 WRXCobbProtuned


Hi, you need to read the map notes, you have to have stock intake.
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